*{
    margin: 0;
    padding: 0;
    list-style-type: none;
}
.content_box{
    width: 90%;
    height: 100%;
    margin: 0 auto;
    .content{
        height: 500px;
    }
}
.block {
    width: 700px;
    margin: 0 auto;
    margin-top: 40px;
}